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Enzymatic Production of l-Tryptophan from l- and dl-5-Indolyl-methylhydantoin by Newly Isolated Bacterium
Authors:Konosuke Sano  Kenzo Yokozeki  Chikahiko Eguchi  Teruhiko Kagawa  Ichiro Noda  Koji Mitsugi
Institution:Central Research Laboratories of Ajinomoto Co., Inc., Kawasaki, Japan
Abstract:Bacteria which can hydrolyze dl-5-indolylmethylhydantoin to l-tryptophan were isolated from various soils. The dl-5-indolylmethylhydantoin-hydrolyzing enzymes were found to be inducible and intracellular. With intact cells, 50 mg/ml as wet base, of newly isolated bacterial strain T-523, 10 mg/ml of dl-5-indolylmethylhydantoin dissapeared and 7.4 mg/ml of l-tryptophan in a molar yield of 82% was produced after 35 hr incubation. Tryptophan produced was confirmed to be l-form regardless of the stereoisomer of the substrates used. A mechanism of asymmetric hydrolysis of dl -5-indolyImethylhydantoin was discussed.
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